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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Income Statement [Abstract]        
Revenues $ 1,939,438 $ 2,145,958 $ 5,673,164 $ 5,719,615
Cost of services (including depreciation) 1,704,223 1,809,055 4,972,538 4,862,449
Gross profit 235,215 336,903 700,626 857,166
Selling, general and administrative expenses 145,687 196,494 441,073 500,593
Amortization of intangible assets 8,650 9,125 25,674 25,160
Operating income 80,878 131,284 233,879 331,413
Interest expense (2,021) (1,321) (5,096) (3,431)
Interest income 346 900 1,118 3,041
Equity in earnings (losses) of unconsolidated affiliates     (314) (332)
Other income (expense), net (1,070) (378) (1,416) (635)
Income from continuing operations before income taxes 78,133 130,485 228,171 330,056
Provision for income taxes 32,389 37,195 94,574 107,269
Net income from continuing operations 45,744 93,290 133,597 222,787
Net income from discontinued operations 173,212 6,725 193,109 21,320
Net income 218,956 100,015 326,706 244,107
Less: Net income attributable to non-controlling interests 2,568 5,367 10,725 13,969
Net income attributable to common stock 216,388 94,648 315,981 230,138
Amounts attributable to common stock:        
Net income from continuing operations 43,176 87,923 122,872 208,818
Net income from discontinued operations 173,212 6,725 193,109 21,320
Net income attributable to common stock $ 216,388 $ 94,648 $ 315,981 $ 230,138
Earnings per share attributable to common stock-basic and diluted:        
Continuing operations $ 0.23 $ 0.40 $ 0.59 $ 0.95
Discontinued operations 0.92 0.03 0.94 0.10
Net income attributable to common stock $ 1.15 $ 0.43 $ 1.53 $ 1.05
Shares used in computing earnings per share:        
Weighted average basic shares outstanding 188,951 219,492 206,181 219,395
Weighted average diluted shares outstanding 188,961 219,517 206,193 219,420